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    <title>Document</title>
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    <script>
    //js实现打乱数组
    function getArrRandomly(arr){
      var len=arr.length;
      for(var i=0;i<len;i++){
          var randomindex=Math.floor(Math.random()*(len-i));
          var itemAtindex=arr[randomindex];
          arr[randomindex]=arr[i];
          arr[i]=itemAtindex;
      }
      return arr;
    }
    var arr=[1,2,3,4,5,6,7,8,9];
    console.log(getArrRandomly(arr));
    </script>
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